Re: [Crash-utility] crash problems with linux-4.5

> > > > Hi, > > > > > > > > Just forcing a crash dump via 'echo c > /proc/sysrq-trigger' results > > > > in a crash > > > > dump that has no tasks saved. I see _lots_ of these errors when > > > > loading the > > > > dump with the latest crash from the git repo: > > > > > > > > crash: page excluded: kernel virtual address: ffff88103c5a9000 > > > > type: > "fill_task_struct" > > > > WARNING: active task ffff881078a04340 on cpu 3 not found in PID hash > > > > > > > > Then nothing is in the dump: > > > > > > > > crash> ps > > > > PID PPID CPU TASK ST %MEM VSZ RSS COMM > > > > > 0 0 0 ffffffff81c0f4c0 RU 0.0 0 0 > > > > > [swapper/0] > > > > crash> > > > > > > > > Any ideas? > > > > > > > > I'm using top-o-tree from Dave's git repo > > > > https://github.com/crash-utility/crash.git: > > > > > > > > commit 04ab5c560a58246e782509d99214afcaf8462b4c > > > > Author: Dave Anderson <anderson(a)redhat.com&gt; > > > > Date: Tue Mar 1 16:16:48 2016 -0500 > > > > > > > > Put 2016 copyright in initial banner. > > > > > > > > > > > > Thanks, > > > > > > > > Steve. > > > > > > If you have configured kdump to use makedumpfile -d31, it is probably > > > this: > > > > > > [Crash-utility] makedumpfile: 4.5 kernel commit breaks page > > > filtering > > > > > > https://www.redhat.com/archives/crash-utility/2016-February/msg00009.html > > > > > > > PS: I'm not on the crash-utility list, so please include my email in > > > > any > > > > replies. > > > > > > PS: if you're using crash on bleeding edge kernels, you might want to > > > join > > > the list, at least in digest mode. > > > > Thanks Dave. I've joined. :) > > > > I changed the makedumpfile line in /etc/init.d/kdump from -d 31 to -d > > 17, > > then removed the kdump initrd from /boot, and restarted kdump to > > generate > > the new initrd file. I then rebooted, and produced a new crash dump. > > But > > I'm still seeing the same issue. > > > > Am I doing the correct procedure for forcing makedumpfile to use -d17? > > I think so, yes. And downgrading to -d17 seems to have worked, at least > for > the two reporter on this list. You can verify that the -d configuration > is as > expected by entering: > > crash> help -D | grep dump_level > Hmm: still using 31: crash> help -D|grep dump_level dump_level: 31 (0x1f) (DUMP_EXCLUDE_ZERO|DUMP_EXCLUDE_CACHE|DUMP_EXCLUDE_CACHE_PRI|D UMP_EXCLUDE_USER_DATA|DUMP_EXCLUDE_FREE) crash> Apparently the makedumpfile parameters being used are not the ones in /etc/init.d/kdump.